System and method for air containment zone air leakage detection
A system for measuring hot or cold aisle containment air leakage in a data center includes a plurality of equipment enclosures arranged in a first row and a second row, a plurality of panels cooperatively arranged with the plurality of equipment enclosures to form an air containment region, and a conduit mounted within the air containment region and sealed at each end, the conduit having an orifice and a plurality of openings distributed at substantially uniform intervals along a length of the conduit.
1. A system for measuring hot or cold aisle containment air leakage in a data center, the system comprising:
a plurality of equipment enclosures arranged in a first row and a second row;
a plurality of panels cooperatively arranged with the plurality of equipment enclosures to form an air containment region;
a conduit mounted within the air containment region and sealed at each end, the conduit having an orifice and a plurality of openings distributed at substantially uniform intervals along a length of the conduit;
a differential air pressure detection device coupled to the orifice and configured to detect a difference between an air pressure within the conduit and ambient air pressure outside of the air containment region; and
an air flow measurement device configured to calculate an infiltration air flow rate of the air containment region based on the difference between the air pressure within the conduit and the ambient air pressure,
wherein the infiltration air flow rate of the air containment region is calculated as in the equation:
scfm=(61474.2 *R HACS −36082.5)* DP +offset
wherein scfm is the air containment system infiltration rate, R HACS is the opening area ratio for the air containment system, DP is the absolute value of the ambient air pressure in inches of water column less the air containment system internal air pressure in inches of water column, and offset is a constant value.
2. The system of claim 1 , wherein the differential air pressure detection device includes a manometer.
3. The system of claim 1 , wherein the offset is 750.
4. The system of claim 1 , wherein the conduit is mounted substantially horizontally within the air containment region.
5. The system of claim 1 , wherein the plurality of openings are substantially upwardly facing.
6. The system of claim 1 , wherein the conduit is mounted at a vertical height of approximately two-thirds of an interior height of the air containment region.
7. The system of claim 1 , wherein the length of the conduit is substantially the same as an interior length of the air containment region.
8. The system of claim 1 , wherein a diameter of the conduit is approximately one and one-half inches.
9. The system of claim 8 , wherein a diameter of each of the plurality of openings is approximately one-quarter of one inch.
10. The system of claim 9 , wherein a distance between one of the plurality of openings and another of the plurality of openings is approximately six inches.
11. A method of measuring hot or cold aisle containment air leakage in a data center, the method comprising:
providing a conduit that is mounted within an air containment region defined by an assembly having a plurality of panels cooperatively arranged with a plurality of equipment enclosures, the conduit being sealed at each end and having an orifice and a plurality of substantially upwardly facing openings distributed at substantially uniform intervals along a length of the conduit;
detecting an air pressure within the conduit;
detecting an ambient air pressure outside of the air containment region;
determining an air pressure differential based on a difference between the air pressure detected within the conduit and the detected ambient air pressure; and
calculating an infiltration air flow rate of the air containment region based on the determined air pressure differential,
wherein the infiltration air flow rate of the air containment region is calculated as in the equation:
scfm=(61474.2 *R HACS −36082.5)* DP +offset
wherein scfm is the air containment system infiltration rate, R HACS is the opening area ratio for the air containment system, DP is the absolute value of the ambient air pressure in inches of water column less the air containment system internal air pressure in inches of water column, and offset is a constant value.
12. The method of claim 11 , wherein the conduit is mounted substantially horizontally at a vertical height of approximately two-thirds of an interior height of the air containment region, and wherein the length of the conduit is substantially the same as an interior length of the air containment region.
13. The method of claim 11 , wherein detecting the air pressure within the conduit includes coupling an air pressure detection device to the orifice and using the air pressure detection device to detect the air pressure within the conduit.